PROPERTY PLANT AND EQUIPMENT, NET

12 Months Ended

Dec. 31, 2017

PROPERTY PLANT AND EQUIPMENT, NET

PROPERTY PLANT AND EQUIPMENT, NET

NOTE F — PROPERTY PLANT AND EQUIPMENT, NET

Property, plant and equipment, net were comprised of the following:

	December 31,
(in thousands)	2017			2016
Land	$	644		$	704
Buildings	28,180			28,160
Furniture and fixtures	12,968			12,312
Machinery and equipment	26,838			26,173
Equipment leased to third parties under operating leases	31,100			32,669
Leasehold improvements	100,999			95,376
Computers and software	65,455			87,147
Total property, plant, and equipment, gross	266,184			282,541
Less: Accumulated depreciation	(172,569		)	(182,074		)
Total property, plant, and equipment, net	$	93,615		$	100,467

Total depreciation expense was approximately $29.7 million, $31.0 million, and $32.5 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Included within Buildings was $24.1 million and $23.8 million recorded as an asset for certain build-to-suit leases as of December 31, 2017 and 2016, respectively.  Accumulated depreciation on these assets was $8.9 million and $7.7 million as of December 31, 2017 and 2016, respectively.

The following table summarizes our investment in equipment leased to third parties under operating leases:

	December 31,
(in thousands)	2017			2016
Program equipment	$	31,100		$	32,669
Less: Accumulated depreciation	(19,954		)	(22,850		)
Net book value	$	11,146		$	9,819